WASHINGTON, D.C. – Today, U.S. Representatives Martha McSally (AZ-02) and Will Hurd (TX-23), Chair and Vice Chair of the Committee on Homeland Security’s Border and Maritime Security Subcommittee, sent an oversight letter asking for specific details of the Administration’s request for $999 million to plan, design, and construct the first installment of a border wall between the United States and Mexico.

Addressed to Secretary of Homeland Security John Kelly, and Director of the Office of Management and Budget Mick Mulvaney, the letter lays out a series of detailed questions to DHS in order to provide the lawmakers with further clarity regarding the President’s recent supplemental appropriations request, which was sent to Congress on March 16, 2017.

The two lawmakers, whose districts collectively represent 880 miles— nearly half— of the U.S-Mexico border, seek specific details of the location of the proposed wall, definitions of adequate natural barriers, and a breakdown of the investments in supplemental technology, infrastructure, and alleviating personnel backlogs.

“As Representatives of the communities that make up our southern border, we recognize the need for robust border security and infrastructure to ensure public safety and increase cross border commerce,” the lawmakers write. “We also have an obligation to be good stewards of taxpayer dollars and as such have a number of questions.”

“While we have both publicly stated in the past that we believe physical barriers to be one of many tools required to gain operational control of the border,” continued the lawmakers, “we also believe that an expenditure this large, and submitted with limited details, deserves additional scrutiny to ensure funds are being used effectively in pursuit of our shared goal of securing the southwest border.”